I have turned debugging On and now trying to refresh the pages and looking for quantity of queries Joomla! doing.

First refreshing was very exciting because amount of SQL queries decreased at two times or even more.

I noticed that refreshing the same page caused decreasing of SQL queries to 10-12. But when I am opening some page surfing from another page - it has 60-90 queries "for the first visit" (even if I already visited those page just a minute ago).